Source : Free On-Line Dictionary of Computing

OBJ
     
        Joseph Goguen 1976.  A family of declarative "ultra high
        level" languages.  Abstract types, generic modules, subsorts
        (subtypes with {multiple inheritance}), pattern-matching
        modulo equations, E-strategies (user control over laziness),
        module expressions (for combining modules), theories and views
        (for describing module interfaces).  For the massively
        parallel RRM (Rewrite Rule Machine).
     
        ["Higher-Order Functions Considered Unnecessary for
        Higher-Order Programming", J.A. Goguen, in Research Topics in
        Functional Programming].